[Stocker]

My new digital caliper arrived today and here's what it says:

Friction pads are .18", retainers are .06".

Pad doesn't quite fully seat in retainer but probably would if you file the corners just a tiny bit.
I measured the retainer + pad at .26", indicating a .02" gap which may close up when the pads are installed.

Now to see how they actually fit in place.